Active Room Equalisation - Page 2 - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd January 2003, 12:21 PM   #11
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Guy's ahve you checked Nelson Pass' ideas ?
__________________
/Per-Anders (my first name) or P-A as my friends call me
Tube Buffered Gainclone in work |Thread || Diamond buffer |Thread for the group buy | Wiki
  Reply With Quote
Old 2nd January 2003, 02:39 PM   #12
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Quote:
Originally posted by peranders
Guy's ahve you checked Nelson Pass' ideas ?
What ideas are presented in the thread you linked? All I see is the scan of part of a magazine page in a language most of us can't understand.

How 'bout you translate it and post it.
  Reply With Quote
Old 2nd January 2003, 04:13 PM   #13
halojoy is offline halojoy  Sweden
On Hiatus
 
Join Date: Nov 2002
Arrow Nelson Pass active room correction

I guess Nelson himself can enlighten us the best.

I found this:
Quote:
Barton:
-------------------------
What the future holds is little black boxes that can enhance loudspeakers and do some DSP things that will improve the performance of the loudspeaker for both home-theater and stereo applications. It is possible that we will integrate [the DSP] with full-range powered speakers that really need just a digital source, not unlike what Meridian does in some of their products. I think that's becoming feasible in an affordable range of speakers costing, say, under $4000 for a system.

There's another area that I'd like to develop, working in conjunction with some research going on at NRC that involves active noise control. How that translates to hi-fi reproduction is active absorption, which is the opposite of an adaptive loudspeaker. It sort of "anti-adapts" to the acoustic environment. At low frequencies, I think this could be very effective. I remember years ago there was a tall, slim column called the Black Shadow. Who made that?

Atkinson:
Nelson Pass designed it for Threshold at the end of the '80s. The time I heard it, it certainly seemed to kill the low-frequency room resonances...

Barton:
You put it in the corner and pump up the opposite modes, right?Footnote 1

Atkinson:
Yeah.
It is copied from this website:
Stereophile Magazine - Archives
----------------------------------------------------------------
History
The Threshold brand was founded by Nelson Pass in 1974, introducing the first of what would be a long series of groundbreaking products using the patented STASIS technology.

http://www.threshold-audio.com/about.html
---------------------------------------------------------------------

halo - when will halojoy get his corrected room?
- No one knows -
  Reply With Quote
Old 12th January 2003, 10:32 AM   #14
Ignite is offline Ignite  Canada
diyAudio Member
 
Join Date: Jul 2001
Location: Toronto, Ontario, Canada
Send a message via ICQ to Ignite
Quote:
Originally posted by haldor

Also you need to eq a system at normal listening volume. Human hearing frequency response is non-linear and changes at different volume levels. We hear lows and highs very poorly at lower volumes. If you setup your eq for good results at 80dB then the system will sound totally different (excessive low end and high end) at 90 dB. That is why it is so important to set sound levels the same when comparing gear.
Idea: volume controlled bass/treble boost. This probably exists anyway, but it'd still be cool. More bass and treble at lower volumes, set up so it just sounds the same at any volume within a reasonable range.
  Reply With Quote
Old 12th January 2003, 08:04 PM   #15
mbroker is offline mbroker  United States
diyAudio Member
 
mbroker's Avatar
 
Join Date: Mar 2002
Location: Fox Valley area in WI
Quote:
Originally posted by Ignite
Idea: volume controlled bass/treble boost. This probably exists anyway, but it'd still be cool. More bass and treble at lower volumes, set up so it just sounds the same at any volume within a reasonable range.
Been desiring one of these for my car for years. Set the EQ to sound nice during city driving (under 40mph), then hve to spend some time resetting it when I jump on the highway at 65mph+. Was hoping to eventually find a decent EQ with memory presets, or something. That way I can push a city/hwy button or something.

Would also like a good EQ for my home theater system. But the only ones I've found are *way* over my budget. After trying to find some suitable log slider pots for less than small fortune, I gave up on the DIY option.

Mark Broker
  Reply With Quote
Old 13th January 2003, 12:24 PM   #16
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default in the PDF for their digital resistors

Analog Devices has a series of filter designs, (HP, LP and BP) which can be "easily" adjusted. There's your design for a computer controlled equalizer.

A tiny spectrum analyzer -- Zetex makes a continuously adjustable bandpass/notch filter -- you don't need particularly steep skirts for this ap -- the chip has an input for local oscillator.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: DAC, room-correction, active crossovers, amp, speakers! taloyd Swap Meet 4 14th April 2009 03:16 PM
Active/Room Equalization sdclc126 Multi-Way 6 24th January 2005 09:13 PM
Active equalisation in full range speakers niallsmart Multi-Way 20 7th October 2003 05:11 AM
Software pre-equalisation of speaker and room = digital magic wand. Circlotron Multi-Way 6 15th September 2003 12:50 PM
Active equalisation, BLISS? walker Multi-Way 6 11th November 2001 11:10 AM


New To Site? Need Help?

All times are GMT. The time now is 04:34 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2